linux-kernel - Re: [PATCH 0/3] Highmem support for 32-bit RISC-V

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Date:   Sun, 3 May 2020 20:20:17 +0530
From:   afzal mohammed <afzal.mohd.ma@...il.com>
To:     Arnd Bergmann <arnd@...db.de>, Russell King <linux@...linux.org.uk>
Cc:     Alan Kao <alankao@...estech.com>, Eric Lin <tesheng@...estech.com>,
        Gary Guo <gary@...yguo.net>, alex@...ti.fr,
        David Abdurachmanov <david.abdurachmanov@...il.com>,
        Anup Patel <Anup.Patel@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Price <steven.price@....com>, atish.patra@....com,
        yash.shah@...ive.com, Albert Ou <aou@...s.berkeley.edu>,
        Palmer Dabbelt <palmer@...belt.com>,
        Greentime Hu <green.hu@...il.com>, zong.li@...ive.com,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...e.de>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 0/3] Highmem support for 32-bit RISC-V

Hi Arnd,

> On Tue, Apr 14, 2020 at 09:29:46PM +0200, Arnd Bergmann wrote:

> > Another thing to try early is to move the vmlinux virtual address
> > from the linear mapping into vmalloc space. This does not require
> > LPAE either, but it only works on relatively modern platforms that
> > don't have conflicting fixed mappings there.

i have started by attempting to move static kernel mapping from lowmem
to vmalloc space. At boot the execution so far has went past assembly
& reached C, to be specific, arm_memblock_init [in setup_arch()],
currently debugging the hang that happens after that point. To make
things easier in the beginning, ARM_PATCH_PHYS_VIRT is disabled &
platform specific PHYS_OFFSET is fed, this is planned to be fixed once
it boots.

[ i will probably start a new thread or hopefully RFC on LAKML ]

Regards
afzal